USSPs “Unmanned Semi-fixed Sea Platforms for Maritime Surveillance” project will improve Maritime Surveillance by developing the backbone of an advance C5ISTAR federated System of Systems exploiting unmanned semi-fixed platforms at sea. USSPs will integrate legacy assets and systems with innovative solutions, aiming to improve maritime surveillance capabilities, reduce high-value asset utilisation and mission-related costs, and provide cross-domain persistent and permanent maritime situational awareness. It will develop an unmanned, highly-autonomous, energy-efficient and miniaturised oil-rig, technology-based platform capable to integrate a wide range of air, surface, and underwater sensors. These platforms will enable deployment in any geographical region, and operation under adverse environmental conditions.